SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Wenqian Luan,Yuye Yan,Jianxiang Wang,Yingxia Zong,Ruiyang Zhao,Jishu Han,Lei Wang
Conversion of water into renewable hydrogen energy using solar energy is one of the ideal methods to address the current environmental pollution and increasing energy demand. Thus developing the photocatalyst with high efficiency, stability, and a low electron-hole recombination rate becomes very important. In this paper, Zn 3 In 2 S 6 microspheres were synthesized by hydrothermal method, and then In-doped CdSe nanoparticles were loaded on the surface of Zn 3 In 2 S 6 microspheres to form Cd 0.9 In 0.1 Se/Zn 3 In 2 S 6 type II heterojunction. Under simulated sunlight irradiation, the photocatalytic hydrogen production of Cd 0.9 In 0.1 Se/Zn 3 In 2 S 6 reached 11.41 mmol h −1 g −1 , which was 4.61 times and 1.97 times that of Cd 0.9 In 0.1 Se and Zn 3 In 2 S 6 , respectively. The experimental results showed that the formation of type II heterojunction could improve the photocatalytic hydrogen production efficiency by shortening the charge transport distance and inhibiting the recombination of electron-hole pairs. This work will provide new ideas and insights for the development of photocatalytic hydrogen production technology.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Wenwen Li,Hongyan Wang,Zhe Sun,Quanping Wu,Song Xue
Cuprous oxide (Cu 2 O) is an attractive photo-electrocatalyst for sustainable hydrogen production . The main issues limiting the use of Cu 2 O as a photocathode are the severe electron-hole recombination and photo-corrosion in aqueous electrolyte . Herein, to address the above issues, amorphous SiO x overlayers have been deposited on the surface of Cu 2 O as a protective cover using a facile dip-coating method. The overall PEC performances have been greatly improved, as evidenced by the increased photocurrent density (3.1 times of bare Cu 2 O) and improved stability (3.8 times of bare Cu 2 O). The structure and PEC characterizations prove that Si has been gradient-doped into the Cu 2 O, leading to a downward band bending from the bulk to the surface region, which promotes the charge separation and transfer efficiently. In addition, the amorphous SiOx layers serve as protection layers and prevent the Cu 2 O from direct contact with the electrolyte, maintaining a high photocurrent density over the stability test. Decoration with Pt catalyst has further boosted the photocurrent density to be 2.8 mA cm −2 at 0 V vs. RHE with better stability, indicating the synergistic effect of SiOx layer and Pt catalyst This work provides a facile strategy to improve the PEC activity and stability of Cu 2 O, which may be extended to other systems with photo-corrosion problems, such as BiVO 4 or ZnO.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Deng Ding,Zhuo Jiang,Dong Ji,Myung Nosang Vincent,Ling Zan
To enhance the photocatalytic activity, co-catalysts are often utilized to accelerate rate-limited surface reactions. Herein, various amounts of bismuth oxyselenide (Bi 2 O 2 Se) ( i.e. , 5 to 25 wt%) as a novel co-catalyst were deposited on TiO 2 nanoparticles for photocatalytic hydrogen evolution reaction. The 15% Bi 2 O 2 Se/TiO 2 showed the best enhanced hydrogen production rate of 1240.7 μmol h −1 g −1 , which was about 50 times greater than that of pure TiO 2 . The SEM, EDX-Mapping and TEM revealed the mechanism of in-growth of Bi 2 O 2 Se on the TiO 2. Trapping experiment of superoxide free radical (O 2 − ) and transient photocurrent decay measurement also revealed that the recombination of the photogenerated electron–hole was remarkably suppressed in Bi 2 O 2 Se/TiO 2 compared to pure TiO 2 . Detailed analysis of XPS, transient photocurrent responses, electrochemical impedance spectroscopy (EIS) and DFT calculations indicated that there is a strong interaction between Bi 2 O 2 Se and TiO 2 , and the electrons of TiO 2 can be injected into Bi 2 O 2 Se. These findings show the potential of Bi 2 O 2 Se as co-catalytic materials and open a new avenue for solar water splitting.
研究领域:
材料科学
·
能源科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS TECHNOLOGY
·
2018
·
IF 1.232
Jie Yang,Hairong Chu,Mingxin Zhu,Haiqin Zhou,Yanhua Xu
In order to solve the disadvantages of most of the photocatalyst, ZnFe2O4 is chosen as the magnetic material and prepared ZnFe2O4/Ag3PO4 composite photocatalysts. ZnFe2O4 is prepared by hydrothermal method, the ZnFe2O4/Ag3PO4 is prepared by precipitation method, which supported Ag3PO4 on the surface of ZnFe2O4. The synthesis method of ZnFe2O4/Ag3PO4 not only simplifies the preparation process, but also improves the photocatalytic activity by suppressing the electron-hole recombination. These methods have important significance for the function alization and stability of photocatalytic materials. Moreover, the ZnFe2O4/Ag3PO4 is characterised by a series of testing means, such as SEM, XRD and EDS, etc. At the same time, this work realizes the effective control of environmental pollutants and lay the foundation for the research of organic pollution remove.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 6
·065515
·
IF 1.449
Xialin Peng,Yonggang Zhang,Ying Liu
Noble metal Ag nanoparticles were deposited on Ag3PO4/P25 heterojunction structure by ultraviolet (UV) light induction to construct Ag/Ag3PO4/P25 double heterojunction catalyst for efficient decomposition of phenacetin (PNT). X-Ray Diffraction (XRD), x-ray photoelectron spectroscopy (XPS), Raman and photoluminescence (PL) spectroscopy analyses were employed to evaluate the microstructure, chemical structure and photocatalytic activity of synthesized catalyst materials. PL spectroscopy analyses revealed that a considerable enhancement in photochemistry activity of Ag3PO4/P25 due to the deposition of Ag. The effects of Ag3PO4 mass ratios, operating conditions on PNT degradation and catalyst stability were also investigated. Results showed that Ag/10% Ag3PO4/P25 under the operating conditions of catalysts concentration of 0.5 g L−1 and pH of 9.0 with UV light irradiation displayed a better photocatalysis degradation performance. When the concentration of PNT was 20 mg L−1, the removal rate of PNT and TOC obtained from Ag/Ag3PO4/P25 system were up to 97 % and 83%, respectively. The removal rate of PNT drops from 97% to 85% between the first and last cycles after 60-min conversion. Ag/Ag3PO4/P25 with a high catalytic reaction efficiency was ascribed to the deposition of Ag. Ag is an electron acceptor and Ag3PO4 have excellent electron conductivity in a heterostructure, the novel Ag/Ag3PO4/P25 composite catalyst could reduce the recombination rate of electron-hole pairs and prolong the lifetime of photogenerated electrons.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 24
·期 1
·45-54
·
IF 1.385
Ma Jing,Xu Shangyuan,Chu Jia,Xue Juanqin,Tang Jieli,Qiang Liangsheng
In this paper, a series of metal supported TiO 2 /SBA-16 photocatalysts were successfully synthesized by wet impregnation method. The synthesized samples were characterized by X-ray diffraction (XRD), Raman spectra, N 2 adsorption–desorption, transmission electron microscopy (TEM), UV–visible absorption spectra (UV-vis) and X-ray photoelectron spectroscopy (XPS). It was found that SBA-16 retained the ordered mesostructure after modification. The results shown that loading different metal elements was found to have significant influences on the crystallographic structure and physical properties. Moreover, the prepared materials were evaluated on photodegradation of Rhodamine B (RhB). Experiment results showed that the degradation of RhB by these catalysts follows the pseudo-first-order kinetic model. The effect of metal element on photocatalytic activity can be attributed that the appropriate amounts of metal concentration can enhance the photocurrent due to the reduced electron–hole recombination, which can improve the efficiency of photocatalytic reactions.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Liwei Zhang,Tianqi Wang,Ying Yang,Meijie Wei,Feng Li,Hui Yu,Xiangting Dong
MoS 2 is a promising gas sensing material due to its low resistance and low operating temperature. But the sensitivity of MoS 2 is limited by fast electron-hole complexation. In this work, phosphomolybdic acid (PMo 12 ) was used as precursor. After sulfurizing by one-step hydrothermal method , the generated MoS 2 and unspent PMo 12 can in-situ form MoS 2 /PMo 12 composite nanospheres . The gas sensing performances of the composite were comprehensively investigated. By adjusting hydrothermal reaction temperature, optimized sensitivity (MoS 2 /PMo 12 -240) to NO 2 gas can be gained. At a low operating temperature of 80 °C, the optimized response value to 100 ppm NO 2 gas is 2.466, which is higher than most reported MoS 2 -based NO 2 sensors. Moreover, MoS 2 /PMo 12 -240 composite also exhibits good selectivity, repeatability, long-term stability and humidity resistance. The mechanism of sensing performance enhancement was also analyzed and discussed. As a semiconductor-like material, PMo 12 can form heterojunction together with MoS 2 . The valence band of PMo 12 can capture the holes in MoS 2 and effectively suppresses electron-hole complexation. Thus the sensing performance can be improved. This work provides a new strategy for designing and constructing high performance sulfide composite gas sensors by introducing POMs .
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Jia Guangri,Sun Fusai,Zhou Tao,Wang Ying,Cui Xiaoqiang,Guo Zhengxiao,Fan Fengtao,Yu Jimmy C.
Artificial photosynthesis is a promising approach to produce clean fuels via renewable solar energy. However, it is practically constrained by two issues of slow photogenerated carrier migration and rapid electron/hole recombination. It is also a challenge to achieve a 2:1 ratio of H 2 and O 2 for overall water splitting. Here we report a rational design of spatially differentiated two-dimensional Bi 4 Ti 3 O 12 nanosheets to enhance overall water splitting. Such a spatially differentiated structure overcomes the limitation of charge transfer across different crystal planes in a single crystal semiconductor. The experimental results show a redistribution of charge within a crystal plane. The resulting photocatalyst produces 40.3 μmol h –1 of hydrogen and 20.1 μmol h –1 of oxygen at a near stoichiometric ratio of 2:1 and a solar-to-hydrogen efficiency of 0.1% under simulated solar light.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 11
·4332-4339
·
IF 3.288
Qixiao Gai,Shoutian Ren,Xiaochun Zheng,Wenjun Liu,Quanli Dong,Renxi Gao
Transition metal phosphides are efficient cocatalysts in photocatalytic water splitting processes, but these phosphides are usually synthesized through harsh and tedious processes, therefore, achieving a simple, controllable and in situ loading on the photocatalyst surface is especially valuable. In this paper, two-dimensional CdS nanosheets were prepared using a hydrothermal method, followed by in situ loading of nickel phosphide (NiPx) nanoparticles on their surface by a photochemical reduction method, and NiPx loading amounts could be adjusted just by the photodeposition time. The synthesized CdS–NiPx was characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffractometer, fluorescence spectroscopy and so on. CdS–NiPx exhibited better photocatalytic performances than bare CdS, and the optimal hydrogen evolution rate of 28.7 mmol g−1 h−1 was realized for CdS–NiPx with a photoreduction time of 20 min. The enhancement mechanism of their photocatalytic activity was estimated by comparing the photoluminescence spectra, electrochemical impedance spectra and transient photocurrent spectra of CdS–NiPx and CdS, which indicated that photodeposited NiPx could serve as excellent cocatalysts to efficiently suppress the recombination of electron–hole pairs photogenerated in CdS.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhenda Liang,Haiqing Wang,Kena Zhang,Ge Ma,Lishan Zhu,Li Zhou,Bing Yan
Low-cost MnO 2 has been vigorously investigated in the field of catalysis. However, high amount of MnO 2 usually needs to be used in the disinfection process owing to their low photocatalytic activity. In this work, modification of MnO 2 with zeolitic imidazole framework-8 (ZIF-8) for improving the photocatalytic bactericidal performance was explored for the first time. Specifically, MnO 2 /ZIF-8 exhibited complete inactivation of multi-drug resistant Escherichia coli ( E. coli) at a low concentration (3.24 μg/mL) with simulated solar irradiation. The 1 O 2 rather than O 2 − or OH was identified as the major reactive species for the bacterial inactivation. Mechanistic studies indicated that the superior bactericidal property of MnO 2 /ZIF-8 than the pristine material could be ascribed to the increased surface oxygen vacancies (OVs) amount and an inhibited electron and hole recombination. This study provides a novel type of photocatalyst for antibacterial application and may shed light on designing MnO 2 based low-cost nanocomposites with photocatalytic bactericidal capability for the practical water disinfection treatment.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Kanxing Chen,Jincheng Liu,Zhilin Huang,Shuang Zong,Lingling Liu,Wei Tan
Photocatalytic hydrogen evolution is a prospective approach to solve the problem about energy crisis by fossil fuel combustion . As a possible novel photocatalyst for hydrogen generation , MnPS 3 suffered from the lower photocatalytic activity caused by its high electron-hole recombination rate and poor oxidation capability of holes. In this paper, the MnPS 3 nanosheets were exfoliated under sonication process in the solution of N-methylpyrrolidone (NMP) and 3-ethoxypropylamine, and then a series of Z-scheme 2D-0D MnPS 3 –Cs 4 W 11 O 35 composites were prepared by a facile electrostatic assembling approach. The exfoliated MnPS 3 nanosheets with the thickness of 5.4 nm present evidently increased interlayer spacing of 17.6 Å compared with 6.42 Å of bulk MnPS 3 . The Cs 4 W 11 O 35 of 20–25 nm are uniformly immobilized on the surface of 400 nm exfoliated MnPS 3 sheets with strong interfacial interaction of S–W–O bonds. The MnPS 3 –Cs 4 W 11 O 35 composites show extended light absorption area, reduced charge recombination and significantly improved hydrogen generation activity compared with MnPS 3 nanosheets. The highest hydrogen evolution rate of the MnPS 3 –Cs 4 W 11 O 35 composites reaches 99.6 μmol g −1 h −1 with a Cs 4 W 11 O 35 mass percent of 10.9, which is 2.9 times of MnPS 3 nanosheets. The photocatalytic activity of MnPS 3 –Cs 4 W 11 O 35 remains nearly unchanged after 4 cycles. As far as we are aware, there is no work carried out on the exfoliation of MnPS 3 sheets in NMP and the fabrication of MnPS 3 –Cs 4 W 11 O 35 composite for the enhanced photocatalytic hydrogen generation yet. Our work provides a new reference method for the preparation of unlaminated composite materials, and the novel MnPS 3 -based composite will be a useful supplement to the photocatalytic production of clean energy.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Weixuan Zeng,Yuan Bian,Sheng Cao,Yongjin Ma,Yi Liu,Anquan Zhu,Pengfei Tan,Jun Pan
Tantalum oxynitride-based materials, which possess narrow band gaps and sufficient band energy potentials, have been of immense interest for water splitting. However, the efficiency of photocatalytic reactions is still low because of the fast electron–hole recombination. Here, a Sr2Ta2O7–xNx/SrTaO2N heterostructured photocatalyst with a well-matched band structure was in situ constructed by the nitridation of hydrothermal-prepared Sr2Ta2O7 nanosheets. Compared to Sr2Ta2O7–xNx and pure SrTaO2N, the Sr2Ta2O7–xNx/SrTaO2N heterostructured photocatalyst exhibited the highest rate of hydrogen evolution, which is ca. 2.0 and 76.4 times of Sr2Ta2O7–xNx and pure SrTaO2N, respectively, under the similar reaction condition. The enhanced performance arises from the formation of suitable band-matched heterojunction-accelerated charge separation. This work provides a promising strategy for the construction of tantalum oxynitride-based heterojunction photocatalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）